Dack Wack - When you pull someone’s pants down and then slap their nuts

When you pull someone’s pants down and then slap their nuts so hard they can’t even think about putting their pants back up.

I did a 'dack wack' on my brother and he cried for 10 minutes.

My friend did a 'dack wack' on his dad and he ran out of the room screaming.

I did a 'dack wack' on my teacher and she gave me a zero for the whole year.